This is actually a very clear introduction to the principle as far as I can tell, and it's nice that the sample code is grounded in something close to a real-wo

This is actually a very clear introduction to the principle as far as I can tell, and it's nice that the sample code is grounded in something close to a real-world programming scenario (messages, filestores and logs vs the common examples of animals, cars, abstract shapes etc that are often used to model OOP principles) There's some glaring syntax errors in the gists, which might throw new learners off the scent a bit - if your example GitHub repo really does compile and pass it's tests, you might want to copy and paste the working code directly from there. Also OP in time you might want to work on improving your written English grammar - it's a testament to the power of the English language (more forgiving than many others), and the well thought-out article content, that it's perfectly understandable just as it is - but many phrases sound jarring to a native speaker and may lead other readers into a false negative response towards the content itself.